colour.utilities.to_domain_int

colour.utilities.to_domain_int(a: ArrayLike, bit_depth: IntegerOrArrayLike = 8, dtype: Optional[Type[DTypeFloating]] = None) → NDArray[source]

Scale given array \(a\) to int domain. The behaviour is as follows:

  • If Colour domain-range scale is ‘Reference’, the definition is almost entirely by-passed and will conveniently convert array \(a\) to np.ndarray.

  • If Colour domain-range scale is ‘1’, array \(a\) is multiplied by \(2^{bit\_depth} - 1\).

  • If Colour domain-range scale is ‘100’ (currently unsupported private value only used for unit tests), array \(a\) is multiplied by \(2^{bit\_depth} - 1\).

Parameters

  • a (ArrayLike) – Array \(a\) to scale to int domain.

  • bit_depth (IntegerOrArrayLike) – Bit depth, usually integer but can be a numpy.ndarray if some axis need different scaling to be brought to int domain.

  • dtype (Optional[Type[DTypeFloating]]) – Data type used for the conversion to np.ndarray.

Returns

Array \(a\) scaled to int domain.

Return type

numpy.ndarray

Notes

  • To avoid precision issues and rounding, the scaling is performed on float numbers.

Examples

With Colour domain-range scale set to ‘Reference’:

>>> with domain_range_scale('Reference'):
...     to_domain_int(1)
array(1.0)

With Colour domain-range scale set to ‘1’:

>>> with domain_range_scale('1'):
...     to_domain_int(1)
array(255.0)

With Colour domain-range scale set to ‘100’ (unsupported):

>>> with domain_range_scale('100'):
...     to_domain_int(1)
array(2.55)

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